B2200 carb float level adjustment / how to?
 

I have a '92 B2200; How do you go about adjusting the carb float level? It (the gas) is well above the mark in the middle of the sight glass when running at idle. My repair manuel tells me how to check it but not how to adjust it!?! Vehicle is flooding out badly (hard to start/quitting) and I'm suspecting that this is the problem, or at least part of it. Any help/suggestions are greatly appreciated.

Thanks in advance.